Digital Commons Network^™

Finite Element Analysis Of The Femoral Head, Ghandikota Ramamurthy

Theses

Femoral component loosening and Prosthetic stem fractures have renewed interest in conservative alternatives to conventional total hip replacements. One such alternative is the concept of surface replacement. The objective in this study is a finite element analysis of a femoral surface replacement cup with Particular attention given to the interfacial stresses. An axisymmetric model with a grid of two-dimensional isoparametric elements is generated. This study utilizes an adaptive model so as to include the effect of bone remodeling in response to stress. The stiffness is considered to be linearly proportional to the stress in the femoral head and neck. Isotropic …

Mathematical Modeling Of Mass Transfer In A Hollow Fiber Dialyzer, Tzyy-Kai Yu

Theses

A mathematical model describing the flow characteristics and mass transfer has been developed for the hollow fiber dialyzer in countercurrent dialysis.

The theoretical expressions are developed from a typical Graetz problem for the stream side, and a first order differential equation for the dialyzate side. The solution of the dimensionless concentration profile is obtained as a summation of orthogonal eigenfunctions in closed form, which are given as product of an exponential function and a confluent hypergeometric function.

The analytical solution of the model has been examined by adjusting system parameters, like Sherwood number, Peclet number and the geometry of the …

Computer Simulation Of Cavity Filling During Injection Molding Process, Sumit Banerjee

Theses

A numerical technique is proposed for the simulation of cavity filling process during injection molding of glass-bead filled polypropylene. The mold cavity is of cylindrical shape. Marker And Cell (MAC) method is utilized for solving the transient flow phenomena, after a mathematical simulation of the flow model is carried out by using the relevant continuity and-momentum equations governing the system. The complexity of the equations involved, results in the simplifying assumption of incompressible and isothermal flow process. A computer program is written on the basis of finite-difference equations developed during the application of MAC method under the prevailing conditions.

The …

Automation Considerations For A Manufacturing System, Marvin Fachuan Wang

Theses

This thesis examines the present manufacturing system of Apollo Valve Company, a solenoid control valves manufacturing. After analyzing the present system, the automation considerations and proposed new system were recommended.

Chapter 1 presenti the background material of automation and manufacturing system. The development of the automated factory is also included. The plant layout, organization, and departments functions of the present system are briefly described in the Chapter 2. Analysis of the present manufacturing system by the production volume, by plant layout, and by the manufacturing operations, is discussed in Chapter 3.

Proposed automation considerations and improvements, such as group technology …

Behavior Of Channel-Shaped Reinforced Concrete Columns Under Combined Biaxial Bending And Compression, Dureseti Chidambarrao

Theses

The inelastic behavior of irregular shaped reinforced concrete columns has been a constant concern for a structural engineer, to design a safe and economic structure in modern buildings and bridge piers. The shape of the elements in a reinforced concrete structure may be used to optimize its structural strength, to make better use of the available space, to improve the aesthetic appearance of the structure, or to facilitate construction. Due to the locations of the columns, the shapes of the buildings and the nature of the applied loads, many columns are subject to combined biaxial bending and axial load.

Seven …

Simulation Of Rotational Molding, Hersel Ahdout

Theses

A computer program is written in FORTRAN IV to simulate the Rotational Molding process based on the discrete technique suggested by Progelhof and Throne. This program employs three techniques of Finite Difference, Euler's, Crank Nicolson's, and pure implicit, with their inherent accuracy and cost limits. The program has the capability of updating the variable parameters of polymer as the temperature rises, which eventuall leads to the closest simulation possible to the actual experiment.

An Improvement In The Chemical Engineering Simulation System, Roman Andreyuk

Theses

The accurate design of chemical processing plants is important to the chemical engineer. The original version of CHESS (Chemical Engineering Simulation System) greatly reduced the amount of time which previously had to be spent on the design of such plants by providing the engineer with a package which simulated some of the more common pieces of chemical processing equipment found in a typical chemical plant.

The present version of the Chemical Engineering Simulation System (CHESS2) presents a significant improvement over the original version. The improvement was achieved by expanding the thermodynamic package, offering the user a choice of methods by …

An Experimental System For Observation Of The Rat Coronary Microcirculation Using Digital Image Processing, Wolfgang Braun

Theses

A system was constructed which allows direct observation of the coronary microcirculation of the beating rat heart. An EKG triggered strobe is used on the microscope light source to "stop" the action of the beating heart so the surface microvessels can be observed di rectly under the microscope. Experimental results are recorded on videotape and played back for frame-by-frame analysis of the data using digital Image processing techniques such as digital filtering, image extraction, image enhancement and edge detection.

The application of image enhancement techniques (high order and low order enhancement methods ) as well as edge detection using a …

The Quantitative Determination Of The Elemental Composition Of Coal Fly Ash Samples Using X-Ray Fluorescence, Joseph R. Cervassi

Theses

Bulk constituent elements contained in coal fly ash were measured by X-ray fluorescence spectroscopy in eight samples. Four samples were used as calibration standards for the spectrometer since their compositions were previously determined by atomic absorption spectrometry. Calibration coefficients of the standards were calculated with computer assisted regression analysis of the fluorescence spectra, and used to determine the composition of the remaining four samples. The compositions of the latter four samples, as predicted by X-ray fluorescence, were then compared to atomic absorption results. X-ray fluorescence and atomic absorption results agree best when the concentrations of elements in the standards are …

Accuracy And Convergence Of Finite Element Approximations, Gwo-Tar Chang

Theses

In the design of structure, the engineer seeks to determine the distribution of stresses throughout the structure or the displacements at certain points of the structure. The finite element method is a numerical analysis technique for obtaining approximate solutions to engineering problems that are not amenable to closed form solutions.

In this work the triangular element and the rectangular element in plane stress are employed in the development of the formulation of element stiffness equations. The effect of the number of elements on the convergence to the analytical solution was investigated. Similar study using rectangular elements was also carried out …

Selection And Problems Faced By The Handicapped In An Industry, Hemank Babulal Dharia

Theses

This thesis reports on the problems faced by handicapped workers placed in an industrial situation. It discusses some of the frustrations, aspirations and hopes of the disabled to find suitable work as well as the fears and misconceptions of employers who consider the employment of the handicapped.

There is discussed the work done by the author in designing jigs and fixtures to assist handicapped workers in production as well as the models of placement, job understanding and rehabilitation efforts.

The work was done at the Delaware County Branch of the Pennsylvania Association for the Blind, Chester, Pennsylvania where the author …

Computer Simulation Of The Respiratory System, Bruce Diner

Theses

The respiratory system was simulated utilizing a series of three models, each more complex than the previous. The first model simulated the respiratory system as a two compartment model driven by carbon dioxide concentration. The second model, also a two compartment model, simulated periodic breathing while the third model is a three compartment model and simulates acid-base balance disturbances.

In this study, the effects of hyperthyroidism and respiratory center depression on respiration premeasured utilizing the models to obtain data and then compare the results to known physiologic data.

A Finite Difference Solution Of An Ideal, Normal, Impinging Jet, Luis A. Gast

Theses

The free boundary of a circular jet of an irrotational, inviscid, incompressible, fluid impinging normally to a flat surface from a height of 2 times the nozzle radius, was found by a finite difference method.

Starting with a graphical solution, approximate values of the potential were given to the nodes at the field.

Having the equipotential lines perpendicular to the axis of the jet, perpendicular to the impinging surface, and having defined the value of the potential at both the entrance and exit of the jet, a finite difference expression of the Laplace's equation was used in an iteration scheme …

An Analysis For The Blade Coating Of Ctbn Modified Epoxy Adhesive, Jeng-Li Liang

Theses

A resin metering criterion has been developed for processing the prepregs of CTBN-EPOXY resin in which the resin content can be controlled within close tolerances. This criterion was obtained by numerically simulating the flow of CTBN-EPDXY resin in the blade-type metering device at room temperature. The Newtonion case of CTBN-EPOXY resin was selected for the study to avoid dealing with more complicated flow equations. A methodology of using the penalty function/finite element formulation was developed to solve the steady state Navior-Stokes equation.

The rheological data show that the CTBN-EPOXY resin is a non-Newtonion fluid at low shear rate. On the …

Organizing To Manage Future Information Technologies, John Patrick Paczkowski

Theses

The area of information technology has undergone dramatic changes over the past ten years, and the rate of change is expected to continue to accelerate through the 1980's and beyond. The newly developing information systems are providing organizations with numerous options for enhancing the quality of managerial decision making, speeding communications and improving the efficiency and effectiveness of administrative/office processes. Unfortnately, many organizations are discovering that they are unable to effectively assimilate and utilize the technology effectively. Chief executives are finding that the traditional structures for managing Data Processing, Telecommunications, and office systems are often fragmented, lack the technical expertise …

The Hydroxide-, Chymotrypsin-, And Blood-Catalyzed Hydrolysis Of A Series Of Sodium 4-Acyloxy-3-Nitrobenzene Sulfonates, Louis E. Rinaldi

Theses

The kinetics of the hydrolysis of a series of water-soluble aromatic esters (sodium 4-acyloxy-3-nitrobenzene sulfonates) were analyzed in order to determine the effect of a variety of substitutions (on the α-carbon of the acid group) upon the rate of reaction.

The following was observed. That (a), the hydroxide catalyzed and water dependent hydrolyses of these esters are slower for larger substituents and faster for smaller ones. That (b), the chymotrypsin catalytic hydrolysis of these esters shows an acylation reaction step which occurs at a rate greater than deacylation for larger substituents, and at approximately equal rates for smaller ones. Furthermore, …

Computer Simulation Of The Human Hypophysial-Ovarian System, Robert Charles Blencowe

Theses

In order to more adequately simulate the human pituitary-ovarian cycle further refinements were made to the original Bogumil and Feng computer models. This involved the inclusion of equations which mathematically describe the peripheral conversion of prehormones and a subroutine showing the effect of plasma proteins, TeBG, CBG, and albumin on the total concentration of estradiol, progesterone, testosterone, androstenedione, dehydroepiandrosterone and estrone.

Once the models were functioning properly, values for the normal state and for the disease condition, Polycystic Ovary Syndrome (PCO), were obtained. In most cases there exists good agreement between the results reported in the literature and those generated …

Designing Cost Effective Pump Suction Systems Using Statistical Correlation Techniques To Estimate Vessel Elevation Costs, Neil J. Bernstein

Theses

In order to minimize total costs (investment plus operating costs) when elevating process equipment to meet hydraulic requirements, it is essential to establish cost effective and energy efficient pump suction systems. During the early stages of design of such systems it is most critical that preliminary costs be determined in a timely manner to avoid job delays. One method of accomplishing this is through the use of a cost estimating relationship for defining the price behavior of alternative pump suction systems. This thesis describes the procedure used to develop a mathematical model to predict the cost of elevating vertical drums. …

One-Dimensional Compressible Flow Analysis : Isentropic And Normal Shock, Su-Bo Wong

Theses

A computer program to compute and analyse one-dimensional isentropic compressible flow through variable cross-sectional area with or without a normal shock is developed. The program is written in the "FORTRAN LANGUAGE".

In this work, the area change is the predominant cause of change of flow condition. One of the advantage of this program is set on general uses for isentropic flow. In common practice, the values of the isentropic flow property ratios were tabulated or graphically presented as function of the Mach number with a specified specific heat ratio, K (normally K=1.40 was presented). With todays technology, the most versatile …

Managing And Controlling The Manufacturing Operations, Harish Doshi

Theses

No abstract provided.

An Application Of Personal Microcomputer To Solve Mid-Sized Goal Programming Problems, Chanhon Joe Lu

Theses

This thesis develops a microcomputer software to solve mid-sized goal programming problems utilizing the revised simplex method.

Goal programming is an extension of linear programming, but is more powerful and flexible than linear programming because of its capability in handling problems with multiple conflicting objectives, instead of dealing with "one dimensional" objective - profit maximization or cost minimization. Accordingly, goal programming is very useful to the complex organizational environments.

With the help of rapid and accurate computation of digital computers, solving a complex program is not a difficult task at all. However, some medium-sized companies cannot afford a mainframe -computer, …

Automated Instrumentation System For Studies Of Metabolic Rates In Rats, Suhas P. Pathak

Theses

The task of the instrumentation system is to measure the respiratory exchange in rats in a controlled experiment. Air is drawn at a predeter-mined rate in and out of rat chambers. The proportion of oxygen and carbon dioxide in the ensuing air indicates the respiratory rate of the rat. The entire operation is controlled by a microcomputer whose most important functions are: to direct the flow of air through the rat chambers by switching valves; and to collect data about the percentages of gases in question.

Thus with the help of a computer it is possible to monitor and control …

Constructing A Life, Teresa Vaitkus

Theses

None provided.

Bon Mot And Other Confections, Darla J. Kalman

Theses

None provided.

A Limited Comparison Of Ultraviolet Curing And Convection Drying On Paper Permanence, Nancy Bittner

Theses

Archivists, conservators and librarians are concerned with paper permanence. Tests have shown that paper permanence is affected by light (especially ultra violet), temperature and humidity changes, acidity, in sects and rodents, and by general use. Environmental damages are often insidious. The objective of this study is to find whether ultraviolet curing and evaporative drying as experienced in the printing industry would affect paper permanence. Glen G. Gray's procedure for finding the reaction rate (the rate at which chemical reactions are completed) of paper is followed. This method relies on the fact that a chemical reaction occurs at speeds which depend …

A Study Of Lindenwood College Alumni: Donor Vs. Non-Donor, Arnold M. Lewis Jr.

Theses

Unavailable.

A Science Curriculum Incorporating Process Skill Activities Into Content-Oriented Science Programs, Holly Richards

Theses

This curriculum of science activities was developed to be used with a content-oriented text in the intermediate grades of elementary school. It was specifically designed to give students additional practice in using the process skills in the various units of science, The author felt the need for this curriculum after teaching both content- and process-oriented programs, as each left much to be desired when taught in isolation.

This researcher believes that children learn best by doing, and that science is an ideal area in which to develop the skills that produce independent learners and critical thinkers. However, as research shows, …

An Application Of Multi-Dimensional Scaling To The Re-Examination Of Preferred Tone Reproduction, David J. Porter

Theses

Black and white prints were produced of several scenes that varied in both negative contrast and negative exposure. Subjects rated the various prints by categories based on their own personal understanding of what an excellent print was. The boundaries of the categories were found and used to determine the preferred tone reproduction characteristics. Individual differences were also scaled with the use of a proximity measure determined from the categorical data. The preferred contrast (1.46 +0.24) was significantly higher than the contrast that has been found to be preferred in earlier studies. The application of this study to more general situations …

Perception Of Graininess In Complex Photographic Images Through Objective And Subjective Comparison, Glenn E. Mcneill

Theses

A model previously used for the perception of graininess in uniform-density images that exist in electrophotography, has been verified for use in silver-halide photography. In addition, a model has been developed which estimates the sensation of graininess in photographic images of non -uniform density. Given the relationship between graininess and density in uniform-density images, the graininess in a complex image is weighted by the frequency of occurrence of each measured density in the image. Such an analysis is compared to subjective evaluations. It is shown that the graininess model is useful in predicting the sensation of graininess in photographs.

Derivation Of The Transformation Relationship Of Pseudo-Invariant Features Of Two Landsat Images, Jeffrey R. Sefl

Theses

The purpose of this effort was to determine the relationships of the spectral radiance distributions of pseudo-invariant features for a selected pair of Landsat images. The relationships for the four bands (band 4 through band 7) were determined to be linearly related. The transformation equations will map one images brightness values on to a second images brightness values.